D. Lawrie, W. Croft, and A. Rosenberg. Proceedings of the 24th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR 2001, page 349--357. (2000)
D. Lawrie, W., Bruce, and A. Rosenberg. Proceedings of the 24th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, page 349--357. (2001)